<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>记事本</title>
</head>

<body>
    <section id="todoapp">
        <h1>记事本</h1>
        <input v-model="inputValue" @keyup.enter="add" autofocus="autofocus" autocomplete="off" 
            placeholder="请输入" type="text">
        <section>
            <ul>
                <li v-for="(item,index) in list">
                    <div>
                        <span>{{ index+1 }}</span>
                        <label for="">{{item}}</label>
                        <button @click="remove(index)">x</button>
                    </div>
                </li>
            </ul>
        </section>

        <span v-if="list.length!=0">
            <strong>{{ list.length }}</strong> items left
        </span>
    
        <button v-show="list.length!=0" @click="clear">clear</button>
        
    </section>

    

    <script src="https://cdn.jsdelivr.net/npm/vue@2.6.14/dist/vue.js"></script>
    <script>
        var app = new Vue({
            el:"#todoapp",
            data:{
                list:["写代码","吃饭","睡觉"],
                inputValue:"好好学习，天天向上"
            },
            methods: {
                add: function(){
                    this.list.push(this.inputValue);
                },
                remove: function(index){
                    console.log(index);
                    this.list.splice(index,1);
                },
                clear: function(){
                    this.list = [];
                },
                
            },
        })

    </script>
</body>

</html>